湖泊底泥改性固化的强度特性和微观结构

将灰渣胶凝材料作为改性剂应用于湖泊环境疏浚底泥的固化处理，研究了改性淤泥的强度特性，探讨灰渣胶凝材料对淤泥的改性机理。改性淤泥的抗压强度试验结果表明，当灰渣胶凝材料质量掺入比为5 %时，能够显著提高改性淤泥的各个龄期强度；当掺入质量比为12.5 %时，28天强度可以达到1.55 MPa。改性淤泥的早期强度较高，后期强度能持续增长，同时具有良好的耐水浸泡性能。SEM分析表明，灰渣胶凝材料能与底泥颗粒中的活性物质发生火山灰反应，形成高强难溶的胶结物，使改性淤泥中大孔隙数量减少，改善了淤泥土颗粒之间的胶结性能。这说明灰渣胶凝材料是一种性能优异的底泥改性材料。

Strength characteristics and microstructure of solidified lake sludge

The slag cementitious material is used as a new kind of binding agent for solidification/stabilization with lake sludge. The mechanism and strength characteristics of treated sludge are studied. The slag cementitious material can greatly improve the unconfined compressive strength of sludge at various curing periods with the 5 % content, while 12.5 % content is optimal for strength development (1.55 MPa at 28th day). The treated sludge strength is high in early period; and the long-term strength is increasing with a good ability of water resistance. SEM analysis shows that pozzolanic reaction occurred in the slag cementitious material and sludge particles, and formed high strength and insoluble mineral cement to decrease the macropores in treated sludge. The binding performance is obviously improved. All those show that the slag cementitious material is a preferable solidifying agent for lake sludge.